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Comparison of Serum Selenium Levels Between Patients with Newly Diagnosed Atrial Fibrillation and Normal Controls
Biol Trace Elem Res. 2022 May 9. doi: 10.1007/s12011-022-03281-9. Online ahead of print.ABSTRACTAtrial fibrillation (AF) is the most common sustained dysrhythmia in the elderly population. It is estimated to affect more than 30 million people worldwide. AF occurs when abnormal electrical impulses start to activate in the atria and override the heart's natural pacemaker, which can no longer control the heart's rhythm. Since atrial contractility is impaired in AF, blood flow in the atria becomes stasis over time and causes thrombus formation. This thrombus causes the risk of embolism and causes complications such as stroke. ...
Source: Biological Trace Element Research - May 8, 2022 Category: Biology Authors: Isa Ardahanli Halil Ibrahim Ozkan Source Type: research

Cardiorespiratory coupling in cetaceans; a physiological strategy to improve gas exchange? RESEARCH ARTICLE
Andreas Fahlman, Stefan Miedler, Luis Marti-Bonmati, Diana Ferrero Fernandez, Paola Munoz Caballero, Julietta Arenarez, Julie Rocho-Levine, Todd Robeck, and Ashley Blawas In the current study we used transthoracic echocardiography to measure stroke volume (SV), heart rate (fH) and cardiac output (CO) in adult bottlenose dolphins (Tursiops truncatus), a male beluga whale calf [Delphinapterus leucas, body mass (Mb) range: 151–175 kg] and an adult female false killer whale (Pseudorca crassidens, estimated Mb: 500–550 kg) housed in managed care. We also recorded continuous electrocardiogram (ECG) in the ...
Source: Journal of Experimental Biology - September 5, 2020 Category: Biology Authors: Fahlman, A., Miedler, S., Marti-Bonmati, L., Ferrero Fernandez, D., Munoz Caballero, P., Arenarez, J., Rocho-Levine, J., Robeck, T., Blawas, A. Tags: RESEARCH ARTICLE Source Type: research

Stroke effort and relative lung volume influence heart rate in diving sea lions RESEARCH ARTICLE
This study assessed the potential role of exercise and relative lung volume in the regulation of heart rate (fH) during dives of adult female California sea lions instrumented with electrocardiogram (ECG), depth and tri-axial acceleration data loggers. A positive relationship between activity (minimum specific acceleration) and fH throughout dives suggested increased muscle perfusion associated with exercise. However, apart from late ascent, fH during dives was still less than or equal to resting fH (on land). In addition, the activity–fH relationship was weaker in long, deep dives consistent with prioritization of b...
Source: Journal of Experimental Biology - March 10, 2020 Category: Biology Authors: McDonald, B. I., Tift, M. S., Hückstädt, L. A., Jeffko, M., Ponganis, P. J. Tags: RESEARCH ARTICLE Source Type: research

Magnetic resonance imaging (MRI) reveals high cardiac ejection fractions in red-footed tortoises (Chelonoidis carbonarius) SHORT COMMUNICATION
Catherine J. A. Williams, Eva M. Greunz, Steffen Ringgaard, Kasper Hansen, Mads F. Bertelsen, and Tobias Wang The ejection fraction of the trabeculated cardiac ventricle of reptiles has not previously been measured. Here, we used the gold standard clinical methodology – electrocardiogram-gated flow magnetic resonance imaging (MRI) – to validate stroke volume measurements and end diastolic ventricular blood volume. This produced an estimate of ejection fraction in our study species, the red footed tortoise Chelonoidis carbonarius (n=5), under isoflurane anaesthesia of 88±11%. After reduction of the preva...
Source: Journal of Experimental Biology - September 15, 2019 Category: Biology Authors: Williams, C. J. A., Greunz, E. M., Ringgaard, S., Hansen, K., Bertelsen, M. F., Wang, T. Tags: SHORT COMMUNICATION Source Type: research

Magnetic Resonance Imaging (MRI) reveals high cardiac ejection fractions in red-footed tortoises (Chelonoidis carbonarius) SHORT COMMUNICATION
Catherine J. A. Williams, Eva M. Greunz, Steffen Ringgaard, Kasper Hansen, Mads F. Bertelsen, and Tobias Wang The ejection fraction of the trabeculated cardiac ventricle of reptiles has not previously been measured. Here we use the gold standard clinical methodology – electrocardiogram (ECG) gated flow magnetic resonance imaging (MRI) – to validate stroke volume measurements and end diastolic ventricular blood volumes. This produces an estimate of ejection fraction in the red footed tortoise Chelonoidis carbonaria (n=5) under isoflurane anaesthesia of 88±11%. After elimination of the prevailing right-to-...
Source: Journal of Experimental Biology - August 21, 2019 Category: Biology Authors: Williams, C. J. A., Greunz, E. M., Ringgaard, S., Hansen, K., Bertelsen, M. F., Wang, T. Tags: SHORT COMMUNICATION Source Type: research

A New Algorithm to Diagnose Atrial Ectopic Origin from Multi Lead ECG Systems - Insights from 3D Virtual Human Atria and Torso
by Erick A. Perez Alday, Michael A. Colman, Philip Langley, Timothy D. Butters, Jonathan Higham, Antony J. Workman, Jules C. Hancox, Henggui Zhang Rapid atrial arrhythmias such as atrial fibrillation (AF) predispose to ventricular arrhythmias, sudden cardiac death and stroke. Identifying the origin of atrial ectopic activity from the electrocardiogram (ECG) can help to diagnose the early onset of AF in a cost-effective manner. The complex and rapid atrial electrical activity during AF makes it difficult to obtain detailed information on atrial activation using the standard 12-lead ECG alone. Compared to conventional 12-le...
Source: PLoS Computational Biology - January 22, 2015 Category: Biology Authors: Erick A. Perez Alday et al. Source Type: research